Malicious PDF — malware analysis report

Static analysis result for SHA-256 4236838db905ba93…

MALICIOUS

PDF

69.5 KB Created: 2020-12-10 16:57:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f5a12eb52707450af45894f4670cb3da SHA-1: 73bebe9d94ea09ca2708298b09023369aead426a SHA-256: 4236838db905ba933a273fc6ca3259d1bfb799c414a175569dbcf13367685d30
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=north+face+trail+guide+jacket+women%2527s+review'. The ML classifier also flagged this PDF with a high probability of being malicious. The document body, though heavily obfuscated, appears to contain text related to a product review, suggesting a social engineering lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/123?utm_term=north+face+trail+guide+jacket+women%2527s+review In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_5f90add4d4614.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449406/normal_5fc72cd12c2a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493245/normal_5fcaf7959554d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_5f8a9943ed0c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469640/normal_5fbd67b5db1fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe072ce18c5c478ec2a7bc/1606289198112/candy_dispenser_machine_canada.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5b7718e72e5fdbcf18cf/1606376312920/old_creamery_theater_2020_schedule.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b1f5a3ccef3526ed10f8/t/5fd0bed41c49363a9b51cec2/1607515864747/eating_carolina_reaper_pepper_challenge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/686babc4-26c1-485f-952e-9619b1a0bf14/.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce1cff2c00fb19414f5757/t/5fd18ed5a9eaf43bd84e0e0a/1607569110807/nasa_logo_vector.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd2e6d6970b4707d0bf2ca/1606233709276/tenowefig.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc195c23398ff751532e03e/t/5fd18b4687bef85997e71654/1607568199611/92739914665.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 5728 bytes
SHA-256: 9d15c0ba6a618ae466e764c61f515ce56049d982c5d8b5ffc3f831ff4091b3fb
font_01_sfnt_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 10552 bytes
SHA-256: 41f20b65cf7ecda69444ebd1e46e07dbbca2fe64a0dd7b55a601aa2a39ef70b9

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